More U.S. Navy Medium Caliber Projos
Photo one 5 inch 54 cal WWII and current paint schemes. The middle projo is made in two halves, and is assembled by having the bursting charge inserted in a prepackaged sausage shape. The two halves are forced together with an interference fit. It has no rotating band, but instead has a plastic obturator/driving seal that is press fit on the base. The knurling can be seen on the projo to engage the obturator. Projo is a Hi-Frag alloy designed for the rapid fire automatic gun. These halves were factory rejects and were never assembled or painted, vintage 1989. The fuze protector is designed to be removed automatically by the gun, whereas all of the other shown are designed to be unscrewed by hand.
There are a few Bronze and one bronze painted projos in the photos. Bronze is a color used for loading dummies from projos to bombs and mines. Originall WWII projos were bronze. They typically are without rotating bands, so that they don't engage the rifling and stick in the chamber. More recent dummies are merely painted bronze color and no. 2 in photo one.
Photo two, 6 inch 47 cal, the same projo can be used for HE, WP, Chaff, and Illum. The projo on the right is a APCBC Painted practice colors.
Photo three close-up of WWII paint for Illum projos. The projos are labeled "Special Fireworks"
Photo four is the more modern paint scheme for Navy Illum Projos